F-12x bounces alot at high speeds...?

Posting this for a buddy of mine...

His 04' ski seems to bounce alot more than normal lately when at WOT. If you let off and drop it to about 55-60, it stops the bouncing. Anyone got any ideas? He says its been this way since he had it so is this just normal with this ski? Could somthing need adjusted or any other ideas? Thanks